docs: def set_value(self, k, v):
          """Set a value on the proxy, parsing it to a useful datatype if possible"""
          from ast import literal_eval
          if self.engine is None or self.proxy is None:
              self._trigger_set_value(k, v)
              return
          if v is None:
              del self.proxy[k]
          else:
              try:
                  vv = literal_eval(v)
              except (TypeError, ValueError):
                  vv = v
              self.proxy[k] = vv